The iPad isn't locked to one carrier, but its MicroSIM card format makes it difficult to use other data plans, whether in the U.S. or overseas. A straight edge and some scissors are all you need to make a full-size SIM fit.

MicroSIM and SIM cards contain the same pin structure for making device connections, but the SIM simply has more plastic surrounding those pins. With an existing MicroSIM, or just the measurements, you can carefully cut out the heart of a SIM card to fit a MicroSIM slot in the iPad or another device that uses the format—though you don't even need to be all that careful, as shown in the AT&T-to-T-Mobile hack shown in the clip above.

Pulled off your own SIM conversion? How did you do it, and why? Share your SIM secrets in the comments.